Laryngopharyngeal reflux, gastroesophageal reflux and dental disorders: A systematic review.

For the exclusion criteria/confounding factors, the following criteria/ratings were considered for the analysis: No = many conditions were not excluded and the risk of bias in the study results is high; Probably no = some conditions were not excluded and the risk of bias in the study results may be significant; Probably yes = the majority of confounding conditions were excluded and the risk of bias in the study results may be low; Yes = authors carefully excluded the majority of confounding conditions that may bias the interpretation of the study results.

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